package com.foreknow.hospital.filter;

/**
 * Created by foreknow on 2022/4/12.
 */

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

//过滤器
@WebFilter("/*")
public class CorsFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //注意：这里设置只允许http://localhost:8081进行跨域访问
        //http://localhost:8081它表示的是前端的服务地址
        response.setHeader("Access-Control-Allow-Origin", "http://localhost:8081");
        response.setHeader("Access-Control-Allow-Credentials", "true");
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, PUT");
        response.setHeader("Access-Control-Max-Age", "3628800");
        response.setHeader("Access-Control-Allow-Headers", "*");
        filterChain.doFilter(servletRequest, servletResponse);
    }

    @Override
    public void destroy() {

    }
}
